# Supplementary Material (ESI) for Organic & Biomolecular Chemistry # This journal is (c) The Royal Society of Chemistry 2008 data_global _journal_name_full Org.Biomol.Chem. _journal_coden_Cambridge 0177 _publ_contact_author_name 'Ian Fairlamb' _publ_contact_author_address ; Department of Chemistry University of York Heslington York YO10 5DD UNITED KINGDOM ; _publ_contact_author_email IJSF1@YORK.AC.UK _publ_section_title ;A natural light induced regioselective 6pi-electrocyclisation / oxidative aromatisation reaction: Experimental and theoretical insights ; loop_ _publ_author_name 'Ian Fairlamb' 'Hao Dong.' 'Simon B. Duckett' 'Zhenyang Lin.' 'Benjamin E. Moulton' ; C.T.O'Brien ; # Attachment 'ijf0613m.cif' data_ijf0613m _database_code_depnum_ccdc_archive 'CCDC 624078' _audit_creation_method SHELXL-97 _chemical_name_systematic ; ? ; _chemical_name_common ? _chemical_melting_point ? _chemical_formula_moiety 'C22 H18 O3' _chemical_formula_sum 'C22 H18 O3' _chemical_formula_weight 330.36 loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _symmetry_cell_setting Triclinic _symmetry_space_group_name_H-M P-1 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, -y, -z' _cell_length_a 8.1515(8) _cell_length_b 10.0702(10) _cell_length_c 10.3368(10) _cell_angle_alpha 71.999(2) _cell_angle_beta 80.438(2) _cell_angle_gamma 71.163(2) _cell_volume 761.69(13) _cell_formula_units_Z 2 _cell_measurement_temperature 100(2) _cell_measurement_reflns_used 2236 _cell_measurement_theta_min 2.22 _cell_measurement_theta_max 28.30 _exptl_crystal_description block _exptl_crystal_colour yellow _exptl_crystal_size_max 0.23 _exptl_crystal_size_mid 0.15 _exptl_crystal_size_min 0.12 _exptl_crystal_density_meas 0 _exptl_crystal_density_diffrn 1.440 _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 348 _exptl_absorpt_coefficient_mu 0.095 _exptl_absorpt_correction_type multi-scan _exptl_absorpt_correction_T_min 0.905 _exptl_absorpt_correction_T_max 0.990 _exptl_absorpt_process_details 'SADABS v2.03;(Sheldrick)' _exptl_special_details ; ? ; _diffrn_ambient_temperature 100(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type 'CCD area detector' _diffrn_measurement_method 'phi and omega scans' _diffrn_detector_area_resol_mean ? _diffrn_standards_number ? _diffrn_standards_interval_count ? _diffrn_standards_interval_time ? _diffrn_standards_decay_% ? _diffrn_reflns_number 7944 _diffrn_reflns_av_R_equivalents 0.0210 _diffrn_reflns_av_sigmaI/netI 0.0341 _diffrn_reflns_limit_h_min -10 _diffrn_reflns_limit_h_max 10 _diffrn_reflns_limit_k_min -13 _diffrn_reflns_limit_k_max 13 _diffrn_reflns_limit_l_min -13 _diffrn_reflns_limit_l_max 13 _diffrn_reflns_theta_min 2.08 _diffrn_reflns_theta_max 28.34 _reflns_number_total 3760 _reflns_number_gt 2875 _reflns_threshold_expression >2sigma(I) _computing_data_collection 'Bruker SMART' _computing_cell_refinement 'Bruker SMART' _computing_data_reduction 'Bruker SAINT' _computing_structure_solution 'SHELXS-97 (Sheldrick, 1990)' _computing_structure_refinement 'SHELXL-97 (Sheldrick, 1997)' _computing_molecular_graphics 'Bruker SHELXTL' _computing_publication_material 'Bruker SHELXTL' _refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2sigma(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_weighting_scheme calc _refine_ls_weighting_details 'calc w=1/[\s^2^(Fo^2^)+(0.0738P)^2^+0.0804P] where P=(Fo^2^+2Fc^2^)/3' _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _atom_sites_solution_hydrogens geom _refine_ls_hydrogen_treatment constr _refine_ls_extinction_method none _refine_ls_extinction_coef ? _refine_ls_number_reflns 3760 _refine_ls_number_parameters 227 _refine_ls_number_restraints 0 _refine_ls_R_factor_all 0.0624 _refine_ls_R_factor_gt 0.0457 _refine_ls_wR_factor_ref 0.1269 _refine_ls_wR_factor_gt 0.1169 _refine_ls_goodness_of_fit_ref 1.031 _refine_ls_restrained_S_all 1.031 _refine_ls_shift/su_max 0.000 _refine_ls_shift/su_mean 0.000 loop_ _atom_site_label _atom_site_type_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_occupancy _atom_site_symmetry_multiplicity _atom_site_calc_flag _atom_site_refinement_flags _atom_site_disorder_assembly _atom_site_disorder_group C1 C 0.23201(17) 0.71494(14) 0.44141(13) 0.0206(3) Uani 1 1 d . . . C2 C 0.16935(16) 0.60406(13) 0.54895(12) 0.0176(3) Uani 1 1 d . . . C3 C 0.22769(16) 0.46058(13) 0.53924(12) 0.0179(3) Uani 1 1 d . . . C4 C 0.34294(17) 0.42517(14) 0.42543(13) 0.0191(3) Uani 1 1 d . . . H4 H 0.3825 0.3273 0.4197 0.023 Uiso 1 1 calc R . . C5 C 0.39449(17) 0.52912(14) 0.32780(13) 0.0202(3) Uani 1 1 d . . . C6 C 0.50781(19) 0.51459(15) 0.20127(14) 0.0251(3) Uani 1 1 d . . . H6A H 0.5413 0.4132 0.1973 0.038 Uiso 1 1 calc R . . H6B H 0.6123 0.5424 0.2017 0.038 Uiso 1 1 calc R . . H6C H 0.4444 0.5786 0.1215 0.038 Uiso 1 1 calc R . . C7 C 0.16687(16) 0.35141(13) 0.64203(13) 0.0179(3) Uani 1 1 d . . . C8 C 0.05321(16) 0.38785(14) 0.74745(13) 0.0185(3) Uani 1 1 d . . . C9 C -0.00932(16) 0.53281(13) 0.76142(12) 0.0182(3) Uani 1 1 d . . . C10 C -0.12818(17) 0.56790(15) 0.87067(13) 0.0219(3) Uani 1 1 d . . . H10 H -0.1667 0.4935 0.9381 0.026 Uiso 1 1 calc R . . C11 C -0.18785(18) 0.70824(15) 0.87957(14) 0.0244(3) Uani 1 1 d . . . H11 H -0.2674 0.7311 0.9533 0.029 Uiso 1 1 calc R . . C12 C -0.13218(18) 0.81867(15) 0.78026(14) 0.0247(3) Uani 1 1 d . . . H12 H -0.1751 0.9161 0.7872 0.030 Uiso 1 1 calc R . . C13 C -0.01678(17) 0.78842(14) 0.67334(14) 0.0221(3) Uani 1 1 d . . . H13 H 0.0194 0.8650 0.6072 0.027 Uiso 1 1 calc R . . C14 C 0.04941(16) 0.64393(13) 0.66011(13) 0.0184(3) Uani 1 1 d . . . C15 C 0.21271(17) 0.19201(13) 0.64808(12) 0.0183(3) Uani 1 1 d . . . H15 H 0.1777 0.1784 0.5659 0.022 Uiso 1 1 calc R . . C16 C 0.40287(17) 0.10298(13) 0.67672(12) 0.0189(3) Uani 1 1 d . . . H18 H 0.4924 0.1467 0.6167 0.023 Uiso 1 1 calc R . . C17 C 0.42186(18) -0.05425(14) 0.67675(13) 0.0219(3) Uani 1 1 d . . . H17A H 0.5457 -0.1115 0.6716 0.026 Uiso 1 1 calc R . . H17B H 0.3657 -0.0552 0.5993 0.026 Uiso 1 1 calc R . . C18 C 0.32752(18) -0.11526(14) 0.81516(14) 0.0237(3) Uani 1 1 d . . . H18B H 0.2336 -0.1510 0.8017 0.028 Uiso 1 1 calc R . . H18A H 0.4099 -0.1956 0.8764 0.028 Uiso 1 1 calc R . . C19 C 0.25359(17) 0.01771(14) 0.87237(13) 0.0212(3) Uani 1 1 d . . . H19 H 0.2185 -0.0055 0.9723 0.025 Uiso 1 1 calc R . . C20 C 0.10931(17) 0.12794(14) 0.78056(13) 0.0200(3) Uani 1 1 d . . . H20 H 0.0311 0.0786 0.7614 0.024 Uiso 1 1 calc R . . C21 C 0.00682(17) 0.25508(14) 0.83660(13) 0.0209(3) Uani 1 1 d . . . C22 C 0.40241(17) 0.08839(14) 0.82881(13) 0.0204(3) Uani 1 1 d . . . H22A H 0.3727 0.1838 0.8487 0.024 Uiso 1 1 calc R . . H22B H 0.5128 0.0234 0.8681 0.024 Uiso 1 1 calc R . . O1 O 0.34101(12) 0.67015(10) 0.33558(9) 0.0220(2) Uani 1 1 d . . . O2 O 0.19856(13) 0.84297(10) 0.43188(10) 0.0296(3) Uani 1 1 d . . . O3 O -0.09555(13) 0.24905(11) 0.93615(10) 0.0316(3) Uani 1 1 d . . . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_23 _atom_site_aniso_U_13 _atom_site_aniso_U_12 C1 0.0179(6) 0.0190(6) 0.0237(6) -0.0049(5) -0.0006(5) -0.0050(5) C2 0.0172(6) 0.0167(6) 0.0182(6) -0.0031(5) -0.0031(5) -0.0048(5) C3 0.0177(6) 0.0176(6) 0.0172(6) -0.0029(5) -0.0031(5) -0.0043(5) C4 0.0213(6) 0.0167(6) 0.0183(6) -0.0047(5) -0.0003(5) -0.0047(5) C5 0.0206(6) 0.0201(6) 0.0195(6) -0.0049(5) -0.0020(5) -0.0055(5) C6 0.0294(7) 0.0245(7) 0.0200(6) -0.0046(5) 0.0035(5) -0.0097(6) C7 0.0179(6) 0.0171(6) 0.0179(6) -0.0035(5) -0.0019(5) -0.0051(5) C8 0.0178(6) 0.0184(6) 0.0186(6) -0.0040(5) -0.0020(5) -0.0051(5) C9 0.0170(6) 0.0191(6) 0.0179(6) -0.0047(5) -0.0028(5) -0.0044(5) C10 0.0203(6) 0.0247(7) 0.0197(6) -0.0060(5) -0.0005(5) -0.0056(5) C11 0.0220(7) 0.0272(7) 0.0231(7) -0.0110(5) 0.0007(5) -0.0032(5) C12 0.0257(7) 0.0197(6) 0.0292(7) -0.0110(5) -0.0025(6) -0.0029(5) C13 0.0219(6) 0.0195(6) 0.0252(7) -0.0060(5) -0.0034(5) -0.0056(5) C14 0.0173(6) 0.0184(6) 0.0191(6) -0.0050(5) -0.0033(5) -0.0039(5) C15 0.0214(6) 0.0172(6) 0.0165(6) -0.0041(5) -0.0006(5) -0.0068(5) C16 0.0207(6) 0.0173(6) 0.0179(6) -0.0044(5) 0.0002(5) -0.0055(5) C17 0.0256(7) 0.0175(6) 0.0219(6) -0.0061(5) -0.0002(5) -0.0053(5) C18 0.0275(7) 0.0178(6) 0.0240(7) -0.0043(5) 0.0010(5) -0.0071(5) C19 0.0245(7) 0.0183(6) 0.0183(6) -0.0032(5) 0.0012(5) -0.0059(5) C20 0.0209(6) 0.0186(6) 0.0209(6) -0.0039(5) 0.0008(5) -0.0089(5) C21 0.0195(6) 0.0210(6) 0.0212(6) -0.0040(5) 0.0004(5) -0.0072(5) C22 0.0219(6) 0.0196(6) 0.0192(6) -0.0063(5) -0.0018(5) -0.0043(5) O1 0.0249(5) 0.0177(5) 0.0218(5) -0.0039(4) 0.0020(4) -0.0070(4) O2 0.0324(6) 0.0172(5) 0.0353(6) -0.0059(4) 0.0059(5) -0.0074(4) O3 0.0322(6) 0.0280(6) 0.0307(6) -0.0074(4) 0.0134(5) -0.0119(4) _geom_special_details ; All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_site_symmetry_2 _geom_bond_publ_flag C1 O2 1.2041(15) . ? C1 O1 1.3831(16) . ? C1 C2 1.4683(18) . ? C2 C3 1.3978(17) . ? C2 C14 1.4477(18) . ? C3 C7 1.4277(17) . ? C3 C4 1.4386(17) . ? C4 C5 1.3345(18) . ? C4 H4 0.9500 . ? C5 O1 1.3685(15) . ? C5 C6 1.4883(18) . ? C6 H6A 0.9800 . ? C6 H6B 0.9800 . ? C6 H6C 0.9800 . ? C7 C8 1.3684(17) . ? C7 C15 1.5095(17) . ? C8 C9 1.4273(17) . ? C8 C21 1.4930(18) . ? C9 C10 1.4146(18) . ? C9 C14 1.4258(17) . ? C10 C11 1.3652(18) . ? C10 H10 0.9500 . ? C11 C12 1.401(2) . ? C11 H11 0.9500 . ? C12 C13 1.3700(19) . ? C12 H12 0.9500 . ? C13 C14 1.4207(18) . ? C13 H13 0.9500 . ? C15 C16 1.5444(18) . ? C15 C20 1.5568(17) . ? C15 H15 1.0000 . ? C16 C22 1.5326(17) . ? C16 C17 1.5402(17) . ? C16 H18 1.0000 . ? C17 C18 1.5531(19) . ? C17 H17A 0.9900 . ? C17 H17B 0.9900 . ? C18 C19 1.5349(18) . ? C18 H18B 0.9900 . ? C18 H18A 0.9900 . ? C19 C22 1.5359(18) . ? C19 C20 1.5469(18) . ? C19 H19 1.0000 . ? C20 C21 1.5099(19) . ? C20 H20 1.0000 . ? C21 O3 1.2115(16) . ? C22 H22A 0.9900 . ? C22 H22B 0.9900 . ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle_publ_flag O2 C1 O1 114.61(11) . . ? O2 C1 C2 128.03(12) . . ? O1 C1 C2 117.34(11) . . ? C3 C2 C14 121.62(11) . . ? C3 C2 C1 117.90(11) . . ? C14 C2 C1 120.48(11) . . ? C2 C3 C7 118.76(11) . . ? C2 C3 C4 120.31(11) . . ? C7 C3 C4 120.90(11) . . ? C5 C4 C3 120.31(12) . . ? C5 C4 H4 119.8 . . ? C3 C4 H4 119.8 . . ? C4 C5 O1 120.59(12) . . ? C4 C5 C6 128.03(12) . . ? O1 C5 C6 111.37(11) . . ? C5 C6 H6A 109.5 . . ? C5 C6 H6B 109.5 . . ? H6A C6 H6B 109.5 . . ? C5 C6 H6C 109.5 . . ? H6A C6 H6C 109.5 . . ? H6B C6 H6C 109.5 . . ? C8 C7 C3 120.14(11) . . ? C8 C7 C15 113.33(11) . . ? C3 C7 C15 126.53(11) . . ? C7 C8 C9 122.93(11) . . ? C7 C8 C21 108.94(11) . . ? C9 C8 C21 128.11(12) . . ? C10 C9 C14 120.12(12) . . ? C10 C9 C8 121.82(11) . . ? C14 C9 C8 118.06(11) . . ? C11 C10 C9 120.29(12) . . ? C11 C10 H10 119.9 . . ? C9 C10 H10 119.9 . . ? C10 C11 C12 120.20(12) . . ? C10 C11 H11 119.9 . . ? C12 C11 H11 119.9 . . ? C13 C12 C11 121.02(12) . . ? C13 C12 H12 119.5 . . ? C11 C12 H12 119.5 . . ? C12 C13 C14 120.79(12) . . ? C12 C13 H13 119.6 . . ? C14 C13 H13 119.6 . . ? C13 C14 C9 117.58(12) . . ? C13 C14 C2 123.93(11) . . ? C9 C14 C2 118.48(11) . . ? C7 C15 C16 115.28(10) . . ? C7 C15 C20 103.53(10) . . ? C16 C15 C20 102.71(10) . . ? C7 C15 H15 111.6 . . ? C16 C15 H15 111.6 . . ? C20 C15 H15 111.6 . . ? C22 C16 C17 102.27(10) . . ? C22 C16 C15 101.56(10) . . ? C17 C16 C15 106.74(10) . . ? C22 C16 H18 114.9 . . ? C17 C16 H18 114.9 . . ? C15 C16 H18 114.9 . . ? C16 C17 C18 103.37(10) . . ? C16 C17 H17A 111.1 . . ? C18 C17 H17A 111.1 . . ? C16 C17 H17B 111.1 . . ? C18 C17 H17B 111.1 . . ? H17A C17 H17B 109.1 . . ? C19 C18 C17 102.97(10) . . ? C19 C18 H18B 111.2 . . ? C17 C18 H18B 111.2 . . ? C19 C18 H18A 111.2 . . ? C17 C18 H18A 111.2 . . ? H18B C18 H18A 109.1 . . ? C18 C19 C22 100.99(10) . . ? C18 C19 C20 107.12(11) . . ? C22 C19 C20 102.43(10) . . ? C18 C19 H19 114.9 . . ? C22 C19 H19 114.9 . . ? C20 C19 H19 114.9 . . ? C21 C20 C19 112.93(11) . . ? C21 C20 C15 106.11(10) . . ? C19 C20 C15 103.38(10) . . ? C21 C20 H20 111.3 . . ? C19 C20 H20 111.3 . . ? C15 C20 H20 111.3 . . ? O3 C21 C8 126.57(12) . . ? O3 C21 C20 125.42(12) . . ? C8 C21 C20 108.00(11) . . ? C16 C22 C19 94.68(10) . . ? C16 C22 H22A 112.8 . . ? C19 C22 H22A 112.8 . . ? C16 C22 H22B 112.8 . . ? C19 C22 H22B 112.8 . . ? H22A C22 H22B 110.2 . . ? C5 O1 C1 123.52(10) . . ? loop_ _geom_torsion_atom_site_label_1 _geom_torsion_atom_site_label_2 _geom_torsion_atom_site_label_3 _geom_torsion_atom_site_label_4 _geom_torsion _geom_torsion_site_symmetry_1 _geom_torsion_site_symmetry_2 _geom_torsion_site_symmetry_3 _geom_torsion_site_symmetry_4 _geom_torsion_publ_flag O2 C1 C2 C3 -179.35(13) . . . . ? O1 C1 C2 C3 1.77(18) . . . . ? O2 C1 C2 C14 1.3(2) . . . . ? O1 C1 C2 C14 -177.54(11) . . . . ? C14 C2 C3 C7 -0.06(19) . . . . ? C1 C2 C3 C7 -179.36(11) . . . . ? C14 C2 C3 C4 178.19(11) . . . . ? C1 C2 C3 C4 -1.12(18) . . . . ? C2 C3 C4 C5 -0.33(19) . . . . ? C7 C3 C4 C5 177.88(12) . . . . ? C3 C4 C5 O1 1.10(19) . . . . ? C3 C4 C5 C6 -177.92(13) . . . . ? C2 C3 C7 C8 0.18(19) . . . . ? C4 C3 C7 C8 -178.05(12) . . . . ? C2 C3 C7 C15 179.06(11) . . . . ? C4 C3 C7 C15 0.8(2) . . . . ? C3 C7 C8 C9 -0.32(19) . . . . ? C15 C7 C8 C9 -179.34(11) . . . . ? C3 C7 C8 C21 178.10(11) . . . . ? C15 C7 C8 C21 -0.92(15) . . . . ? C7 C8 C9 C10 179.35(12) . . . . ? C21 C8 C9 C10 1.2(2) . . . . ? C7 C8 C9 C14 0.32(19) . . . . ? C21 C8 C9 C14 -177.78(12) . . . . ? C14 C9 C10 C11 0.23(19) . . . . ? C8 C9 C10 C11 -178.78(12) . . . . ? C9 C10 C11 C12 0.2(2) . . . . ? C10 C11 C12 C13 -0.4(2) . . . . ? C11 C12 C13 C14 0.1(2) . . . . ? C12 C13 C14 C9 0.29(19) . . . . ? C12 C13 C14 C2 178.97(12) . . . . ? C10 C9 C14 C13 -0.47(18) . . . . ? C8 C9 C14 C13 178.58(11) . . . . ? C10 C9 C14 C2 -179.23(11) . . . . ? C8 C9 C14 C2 -0.18(18) . . . . ? C3 C2 C14 C13 -178.62(11) . . . . ? C1 C2 C14 C13 0.7(2) . . . . ? C3 C2 C14 C9 0.06(19) . . . . ? C1 C2 C14 C9 179.35(11) . . . . ? C8 C7 C15 C16 -112.33(12) . . . . ? C3 C7 C15 C16 68.73(16) . . . . ? C8 C7 C15 C20 -0.99(14) . . . . ? C3 C7 C15 C20 -179.93(12) . . . . ? C7 C15 C16 C22 73.96(12) . . . . ? C20 C15 C16 C22 -37.87(12) . . . . ? C7 C15 C16 C17 -179.30(10) . . . . ? C20 C15 C16 C17 68.88(11) . . . . ? C22 C16 C17 C18 31.39(13) . . . . ? C15 C16 C17 C18 -74.84(12) . . . . ? C16 C17 C18 C19 4.32(13) . . . . ? C17 C18 C19 C22 -38.42(12) . . . . ? C17 C18 C19 C20 68.40(13) . . . . ? C18 C19 C20 C21 171.62(10) . . . . ? C22 C19 C20 C21 -82.58(12) . . . . ? C18 C19 C20 C15 -74.16(12) . . . . ? C22 C19 C20 C15 31.64(12) . . . . ? C7 C15 C20 C21 2.43(13) . . . . ? C16 C15 C20 C21 122.73(11) . . . . ? C7 C15 C20 C19 -116.62(11) . . . . ? C16 C15 C20 C19 3.69(12) . . . . ? C7 C8 C21 O3 -177.07(13) . . . . ? C9 C8 C21 O3 1.3(2) . . . . ? C7 C8 C21 C20 2.52(14) . . . . ? C9 C8 C21 C20 -179.16(12) . . . . ? C19 C20 C21 O3 -70.89(17) . . . . ? C15 C20 C21 O3 176.55(13) . . . . ? C19 C20 C21 C8 109.52(12) . . . . ? C15 C20 C21 C8 -3.04(14) . . . . ? C17 C16 C22 C19 -53.94(11) . . . . ? C15 C16 C22 C19 56.26(11) . . . . ? C18 C19 C22 C16 56.66(11) . . . . ? C20 C19 C22 C16 -53.82(11) . . . . ? C4 C5 O1 C1 -0.37(19) . . . . ? C6 C5 O1 C1 178.80(11) . . . . ? O2 C1 O1 C5 179.88(11) . . . . ? C2 C1 O1 C5 -1.09(18) . . . . ? _diffrn_measured_fraction_theta_max 0.989 _diffrn_reflns_theta_full 28.34 _diffrn_measured_fraction_theta_full 0.989 _refine_diff_density_max 0.427 _refine_diff_density_min -0.212 _refine_diff_density_rms 0.053